Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5144a354f4f9f7…

MALICIOUS

PDF

71.4 KB Created: 2021-09-03 08:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ed2bc130945c6f7c7b4f28466795008 SHA-1: 6f62d4a3d8acbff4cc181d14de3b5205b14dcec7 SHA-256: 6c5144a354f4f9f70c648c613b46a26430140f2ef736bd61a16b9839f2c1adeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised CMS platforms and disposable domains, suggesting a phishing or malware distribution scheme. The file's structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=demasiada+felicidad+alice+munro+pdf PDF link annotation
    • http://elanaclub.ru/userfiles/file/wadepiwenemifiziderufaxix.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/79913743810.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/fanivizizodazevewupeg.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/20638698763.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac6b2574b---tiwusibowesuleg.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/4ddfcb53ead3ef5da0a4488ff5c684d3/14123321240.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/29936187317.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608529347bc81---94113201095.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/3983123675.pdfIn PDF document text
    • http://thedreams.cz/files/74418552121.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/sonexa.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/so16fcg7hose4lb1cshh4psdu5/nifotogonisedutitesadifuz.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec11e09170---vobog.pdfIn PDF document text
    • http://findacommodity.com/upload/file/kufojepeso.pdfIn PDF document text
    • http://nhs1968.com/clients/65482/File/vewubewirejaxotukapijema.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/zaraxejilezesa.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086e1a7a8626---tutugopunitobonaxi.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/27435832986.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/toperuxinetavovegizejak.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/84722387483.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/warolipok.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/todas.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/nibositofud.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BC 10784 bytes
SHA-256: 2c93cb7432c0d77776c842bdb81143431458e7de5af8a7c36493f0a9ff9422a6
font_01_sfnt_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 16200 bytes
SHA-256: 9bb446235697a023ecc4a50f3a1c4c89846fb0ec121c2b72a705c000d19ed0c3
font_02_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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